Radix span* classes on selby and selby_flipped are incorrect

In the selby and selby_flipped layouts, the following regions are supposed to be the same width (and are when using responsive_bartik):

• Content Column 1
• Content Column 2
• Sidebar

But the span* classes that were added for Radix in #2050651: Make Panels layout from Panopoly Theme work with Radix make the Content Columns wider and the Sidebar skinnier. You can see this by enabling Radix 2.

Basically, it's because it's using span9/span3 rather than span8/span4.